64261221 has 16 divisors (see below), whose sum is σ = 88281600. Its totient is φ = 41554800.

The previous prime is 64261217. The next prime is 64261231. The reversal of 64261221 is 12216246.

64261221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64261221 - 2² = 64261217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64261191 and 64261200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64261231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17830 + ... + 21128.

It is an arithmetic number, because the mean of its divisors is an integer number (5517600).

Almost surely, 2^64261221 is an apocalyptic number.

It is an amenable number.

64261221 is a deficient number, since it is larger than the sum of its proper divisors (24020379).

64261221 is a wasteful number, since it uses less digits than its factorization.

64261221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3496.

The product of its digits is 1152, while the sum is 24.

The square root of 64261221 is about 8016.3096871316. The cubic root of 64261221 is about 400.5434716786.

Adding to 64261221 its reverse (12216246), we get a palindrome (76477467).

The spelling of 64261221 in words is "sixty-four million, two hundred sixty-one thousand, two hundred twenty-one".